Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* apc - Driver implementation for power management functions |
| 2 | * of Aurora Personality Chip (APC) on SPARCstation-4/5 and |
| 3 | * derivatives. |
| 4 | * |
| 5 | * Copyright (c) 2002 Eric Brower (ebrower@usa.net) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/miscdevice.h> |
| 13 | #include <linux/pm.h> |
| 14 | |
| 15 | #include <asm/io.h> |
| 16 | #include <asm/sbus.h> |
| 17 | #include <asm/oplib.h> |
| 18 | #include <asm/uaccess.h> |
| 19 | #include <asm/auxio.h> |
| 20 | #include <asm/apc.h> |
| 21 | |
| 22 | /* Debugging |
| 23 | * |
| 24 | * #define APC_DEBUG_LED |
| 25 | */ |
| 26 | |
| 27 | #define APC_MINOR MISC_DYNAMIC_MINOR |
| 28 | #define APC_OBPNAME "power-management" |
| 29 | #define APC_DEVNAME "apc" |
| 30 | |
| 31 | volatile static u8 __iomem *regs; |
| 32 | static int apc_regsize; |
| 33 | static int apc_no_idle __initdata = 0; |
| 34 | |
| 35 | #define apc_readb(offs) (sbus_readb(regs+offs)) |
| 36 | #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs)) |
| 37 | |
| 38 | /* Specify "apc=noidle" on the kernel command line to |
| 39 | * disable APC CPU standby support. Certain prototype |
| 40 | * systems (SPARCstation-Fox) do not play well with APC |
| 41 | * CPU idle, so disable this if your system has APC and |
| 42 | * crashes randomly. |
| 43 | */ |
| 44 | static int __init apc_setup(char *str) |
| 45 | { |
| 46 | if(!strncmp(str, "noidle", strlen("noidle"))) { |
| 47 | apc_no_idle = 1; |
| 48 | return 1; |
| 49 | } |
| 50 | return 0; |
| 51 | } |
| 52 | __setup("apc=", apc_setup); |
| 53 | |
| 54 | /* |
| 55 | * CPU idle callback function |
| 56 | * See .../arch/sparc/kernel/process.c |
| 57 | */ |
| 58 | void apc_swift_idle(void) |
| 59 | { |
| 60 | #ifdef APC_DEBUG_LED |
| 61 | set_auxio(0x00, AUXIO_LED); |
| 62 | #endif |
| 63 | |
| 64 | apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG); |
| 65 | |
| 66 | #ifdef APC_DEBUG_LED |
| 67 | set_auxio(AUXIO_LED, 0x00); |
| 68 | #endif |
| 69 | } |
| 70 | |
| 71 | static inline void apc_free(void) |
| 72 | { |
| 73 | sbus_iounmap(regs, apc_regsize); |
| 74 | } |
| 75 | |
| 76 | static int apc_open(struct inode *inode, struct file *f) |
| 77 | { |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int apc_release(struct inode *inode, struct file *f) |
| 82 | { |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int apc_ioctl(struct inode *inode, struct file *f, |
| 87 | unsigned int cmd, unsigned long __arg) |
| 88 | { |
| 89 | __u8 inarg, __user *arg; |
| 90 | |
| 91 | arg = (__u8 __user *) __arg; |
| 92 | switch (cmd) { |
| 93 | case APCIOCGFANCTL: |
| 94 | if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg)) |
| 95 | return -EFAULT; |
| 96 | break; |
| 97 | |
| 98 | case APCIOCGCPWR: |
| 99 | if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg)) |
| 100 | return -EFAULT; |
| 101 | break; |
| 102 | |
| 103 | case APCIOCGBPORT: |
| 104 | if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg)) |
| 105 | return -EFAULT; |
| 106 | break; |
| 107 | |
| 108 | case APCIOCSFANCTL: |
| 109 | if (get_user(inarg, arg)) |
| 110 | return -EFAULT; |
| 111 | apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG); |
| 112 | break; |
| 113 | case APCIOCSCPWR: |
| 114 | if (get_user(inarg, arg)) |
| 115 | return -EFAULT; |
| 116 | apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG); |
| 117 | break; |
| 118 | case APCIOCSBPORT: |
| 119 | if (get_user(inarg, arg)) |
| 120 | return -EFAULT; |
| 121 | apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG); |
| 122 | break; |
| 123 | default: |
| 124 | return -EINVAL; |
| 125 | }; |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 130 | static const struct file_operations apc_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | .ioctl = apc_ioctl, |
| 132 | .open = apc_open, |
| 133 | .release = apc_release, |
| 134 | }; |
| 135 | |
| 136 | static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops }; |
| 137 | |
| 138 | static int __init apc_probe(void) |
| 139 | { |
| 140 | struct sbus_bus *sbus = NULL; |
| 141 | struct sbus_dev *sdev = NULL; |
| 142 | int iTmp = 0; |
| 143 | |
| 144 | for_each_sbus(sbus) { |
| 145 | for_each_sbusdev(sdev, sbus) { |
| 146 | if (!strcmp(sdev->prom_name, APC_OBPNAME)) { |
| 147 | goto sbus_done; |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | sbus_done: |
| 153 | if (!sdev) { |
| 154 | return -ENODEV; |
| 155 | } |
| 156 | |
| 157 | apc_regsize = sdev->reg_addrs[0].reg_size; |
| 158 | regs = sbus_ioremap(&sdev->resource[0], 0, |
| 159 | apc_regsize, APC_OBPNAME); |
| 160 | if(!regs) { |
| 161 | printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME); |
| 162 | return -ENODEV; |
| 163 | } |
| 164 | |
| 165 | iTmp = misc_register(&apc_miscdev); |
| 166 | if (iTmp != 0) { |
| 167 | printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME); |
| 168 | apc_free(); |
| 169 | return -ENODEV; |
| 170 | } |
| 171 | |
| 172 | /* Assign power management IDLE handler */ |
| 173 | if(!apc_no_idle) |
| 174 | pm_idle = apc_swift_idle; |
| 175 | |
| 176 | printk(KERN_INFO "%s: power management initialized%s\n", |
| 177 | APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : ""); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | /* This driver is not critical to the boot process |
| 182 | * and is easiest to ioremap when SBus is already |
| 183 | * initialized, so we install ourselves thusly: |
| 184 | */ |
| 185 | __initcall(apc_probe); |
| 186 | |